Medium
ovn — security advisory
When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM.
- Products
- ovn
- Affected versions
- 2.12.90~git20200107.c80e014d4-0ubuntu1, 2.12.90~git20200107.c80e014d4-0ubuntu2, 20.03.0-0ubuntu1, 20.03.0~git20200212.9a4e68ec8-0ubuntu1, 20.03.0~git20200212.9a4e68ec8-0ubuntu3, 20.03.1-0ubuntu1, 20.03.1-0ubuntu1.1, 20.03.1-0ubuntu1.2, 20.03.2-0ubuntu0.20.04.1, 20.03.2-0ubuntu0.20.04.2, 20.03.2-0ubuntu0.20.04.3, 20.03.2-0ubuntu0.20.04.4, 20.03.2-0ubuntu0.20.04.5, 20.03.2-0ubuntu0.20.04.6, 21.09.0-0ubuntu2, 21.09.0~git20210922.6549e5842-0ubuntu1, 21.09.0~git20210922.6549e5842-0ubuntu2, 21.12.0-0ubuntu1, 22.03.0-0ubuntu1, 22.03.0~git20220218.ed81be7-0ubuntu1, 22.03.2-0ubuntu0.22.04.1, 22.03.3-0ubuntu0.22.04.1, 22.03.3-0ubuntu0.22.04.2, 22.03.3-0ubuntu0.22.04.3, 22.03.3-0ubuntu0.22.04.5, 22.03.8-0ubuntu0.22.04.1, 23.09.0-1, 23.09.0-2, 24.03.0~git20240205.ebb7076-1, 24.03.1-2ubuntu1, 24.03.1-2ubuntu3, 24.03.2-0ubuntu0.24.04.1, 24.03.2-0ubuntu0.24.04.2, 24.03.6-0ubuntu0.24.04.1, 24.03.8-0ubuntu0.24.04.1, 25.03.0-1, 25.09.0-1, 25.09.0-3, 25.09.0~git20250813.23884f5-maysync1, 26.03.0-2, 26.03.0-6, 26.03.0~git20260216.b543a88-2, 26.03.1-1, 26.09.0-1, 26.09.0~git20260819.c60a7af-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-5265
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:27 UTC · Revision 1
Source evidence
When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM.
osv:UBUNTU-CVE-2026-5265
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
ovn
Fixed versions: Not specified
Complete source record
{
"id": "5109653eedf1f5efb5bd9d36a8c816083cba5dd70258a54b195a4e1489f6f7ca",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-5265",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-5265",
"summary": "When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM.",
"evidence": "osv:UBUNTU-CVE-2026-5265",
"products": [
{
"name": {
"value": "ovn",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.12.90~git20200107.c80e014d4-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "2.12.90~git20200107.c80e014d4-0ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.0~git20200212.9a4e68ec8-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.0~git20200212.9a4e68ec8-0ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.0-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.1-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.1-0ubuntu1.1",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.1-0ubuntu1.2",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.2-0ubuntu0.20.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.2-0ubuntu0.20.04.2",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.2-0ubuntu0.20.04.3",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.2-0ubuntu0.20.04.4",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.2-0ubuntu0.20.04.5",
"evidence": "/affected/0/versions"
},
{
"value": "20.03.2-0ubuntu0.20.04.6",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "ovn",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "21.09.0~git20210922.6549e5842-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "21.09.0~git20210922.6549e5842-0ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "21.09.0-0ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "21.12.0-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.0~git20220218.ed81be7-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.0-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.2-0ubuntu0.22.04.1",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.3-0ubuntu0.22.04.1",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.3-0ubuntu0.22.04.2",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.3-0ubuntu0.22.04.3",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.3-0ubuntu0.22.04.5",
"evidence": "/affected/1/versions"
},
{
"value": "22.03.8-0ubuntu0.22.04.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "ovn",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "23.09.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "23.09.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.0~git20240205.ebb7076-1",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.1-2ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.1-2ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.2-0ubuntu0.24.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.2-0ubuntu0.24.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.6-0ubuntu0.24.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "24.03.8-0ubuntu0.24.04.1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "ovn",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "25.03.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "25.09.0~git20250813.23884f5-maysync1",
"evidence": "/affected/3/versions"
},
{
"value": "25.09.0-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "ovn",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "26.03.0-2",
"evidence": "/affected/4/versions"
},
{
"value": "26.03.0-6",
"evidence": "/affected/4/versions"
},
{
"value": "26.03.1-1",
"evidence": "/affected/4/versions"
},
{
"value": "26.09.0~git20260819.c60a7af-1",
"evidence": "/affected/4/versions"
},
{
"value": "26.09.0-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "ovn",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "25.09.0-1",
"evidence": "/affected/5/versions"
},
{
"value": "25.09.0-3",
"evidence": "/affected/5/versions"
},
{
"value": "26.03.0~git20260216.b543a88-2",
"evidence": "/affected/5/versions"
},
{
"value": "26.03.0-2",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-5265",
"aliases": [
"UBUNTU-CVE-2026-5265"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ovn",
"purl": "pkg:deb/ubuntu/ovn?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"2.12.90~git20200107.c80e014d4-0ubuntu1",
"2.12.90~git20200107.c80e014d4-0ubuntu2",
"20.03.0~git20200212.9a4e68ec8-0ubuntu1",
"20.03.0~git20200212.9a4e68ec8-0ubuntu3",
"20.03.0-0ubuntu1",
"20.03.1-0ubuntu1",
"20.03.1-0ubuntu1.1",
"20.03.1-0ubuntu1.2",
"20.03.2-0ubuntu0.20.04.1",
"20.03.2-0ubuntu0.20.04.2",
"20.03.2-0ubuntu0.20.04.3",
"20.03.2-0ubuntu0.20.04.4",
"20.03.2-0ubuntu0.20.04.5",
"20.03.2-0ubuntu0.20.04.6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ovn-central",
"binary_version": "20.03.2-0ubuntu0.20.04.6"
},
{
"binary_name": "ovn-common",
"binary_version": "20.03.2-0ubuntu0.20.04.6"
},
{
"binary_name": "ovn-controller-vtep",
"binary_version": "20.03.2-0ubuntu0.20.04.6"
},
{
"binary_name": "ovn-docker",
"binary_version": "20.03.2-0ubuntu0.20.04.6"
},
{
"binary_name": "ovn-host",
"binary_version": "20.03.2-0ubuntu0.20.04.6"
},
{
"binary_name": "ovn-ic",
"binary_version": "20.03.2-0ubuntu0.20.04.6"
},
{
"binary_name": "ovn-ic-db",
"binary_version": "20.03.2-0ubuntu0.20.04.6"
}
]
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ovn",
"purl": "pkg:deb/ubuntu/ovn?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
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"21.09.0~git20210922.6549e5842-0ubuntu2",
"21.09.0-0ubuntu2",
"21.12.0-0ubuntu1",
"22.03.0~git20220218.ed81be7-0ubuntu1",
"22.03.0-0ubuntu1",
"22.03.2-0ubuntu0.22.04.1",
"22.03.3-0ubuntu0.22.04.1",
"22.03.3-0ubuntu0.22.04.2",
"22.03.3-0ubuntu0.22.04.3",
"22.03.3-0ubuntu0.22.04.5",
"22.03.8-0ubuntu0.22.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ovn-central",
"binary_version": "22.03.8-0ubuntu0.22.04.1"
},
{
"binary_name": "ovn-common",
"binary_version": "22.03.8-0ubuntu0.22.04.1"
},
{
"binary_name": "ovn-controller-vtep",
"binary_version": "22.03.8-0ubuntu0.22.04.1"
},
{
"binary_name": "ovn-docker",
"binary_version": "22.03.8-0ubuntu0.22.04.1"
},
{
"binary_name": "ovn-host",
"binary_version": "22.03.8-0ubuntu0.22.04.1"
},
{
"binary_name": "ovn-ic",
"binary_version": "22.03.8-0ubuntu0.22.04.1"
},
{
"binary_name": "ovn-ic-db",
"binary_version": "22.03.8-0ubuntu0.22.04.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ovn",
"purl": "pkg:deb/ubuntu/ovn?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"23.09.0-1",
"23.09.0-2",
"24.03.0~git20240205.ebb7076-1",
"24.03.1-2ubuntu1",
"24.03.1-2ubuntu3",
"24.03.2-0ubuntu0.24.04.1",
"24.03.2-0ubuntu0.24.04.2",
"24.03.6-0ubuntu0.24.04.1",
"24.03.8-0ubuntu0.24.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ovn-central",
"binary_version": "24.03.8-0ubuntu0.24.04.1"
},
{
"binary_name": "ovn-common",
"binary_version": "24.03.8-0ubuntu0.24.04.1"
},
{
"binary_name": "ovn-controller-vtep",
"binary_version": "24.03.8-0ubuntu0.24.04.1"
},
{
"binary_name": "ovn-docker",
"binary_version": "24.03.8-0ubuntu0.24.04.1"
},
{
"binary_name": "ovn-host",
"binary_version": "24.03.8-0ubuntu0.24.04.1"
},
{
"binary_name": "ovn-ic",
"binary_version": "24.03.8-0ubuntu0.24.04.1"
},
{
"binary_name": "ovn-ic-db",
"binary_version": "24.03.8-0ubuntu0.24.04.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ovn",
"purl": "pkg:deb/ubuntu/ovn?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"25.03.0-1",
"25.09.0~git20250813.23884f5-maysync1",
"25.09.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ovn-central",
"binary_version": "25.09.0-1"
},
{
"binary_name": "ovn-common",
"binary_version": "25.09.0-1"
},
{
"binary_name": "ovn-controller-vtep",
"binary_version": "25.09.0-1"
},
{
"binary_name": "ovn-docker",
"binary_version": "25.09.0-1"
},
{
"binary_name": "ovn-host",
"binary_version": "25.09.0-1"
},
{
"binary_name": "ovn-ic",
"binary_version": "25.09.0-1"
},
{
"binary_name": "ovn-ic-db",
"binary_version": "25.09.0-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ovn",
"purl": "pkg:deb/ubuntu/ovn?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"26.03.0-2",
"26.03.0-6",
"26.03.1-1",
"26.09.0~git20260819.c60a7af-1",
"26.09.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ovn-central",
"binary_version": "26.09.0-1"
},
{
"binary_name": "ovn-common",
"binary_version": "26.09.0-1"
},
{
"binary_name": "ovn-controller-vtep",
"binary_version": "26.09.0-1"
},
{
"binary_name": "ovn-docker",
"binary_version": "26.09.0-1"
},
{
"binary_name": "ovn-host",
"binary_version": "26.09.0-1"
},
{
"binary_name": "ovn-ic",
"binary_version": "26.09.0-1"
},
{
"binary_name": "ovn-ic-db",
"binary_version": "26.09.0-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ovn",
"purl": "pkg:deb/ubuntu/ovn?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"25.09.0-1",
"25.09.0-3",
"26.03.0~git20260216.b543a88-2",
"26.03.0-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ovn-central",
"binary_version": "26.03.0-2"
},
{
"binary_name": "ovn-common",
"binary_version": "26.03.0-2"
},
{
"binary_name": "ovn-controller-vtep",
"binary_version": "26.03.0-2"
},
{
"binary_name": "ovn-docker",
"binary_version": "26.03.0-2"
},
{
"binary_name": "ovn-host",
"binary_version": "26.03.0-2"
},
{
"binary_name": "ovn-ic",
"binary_version": "26.03.0-2"
},
{
"binary_name": "ovn-ic-db",
"binary_version": "26.03.0-2"
}
]
}
}
],
"modified": "2026-10-17T12:58:33.766129099Z",
"provider": "osv",
"upstream": [
"CVE-2026-5265"
],
"references": [
"https://ubuntu.com/security/CVE-2026-5265",
"https://www.cve.org/CVERecord?id=CVE-2026-5265"
]
},
"related_cves": [
{
"value": "CVE-2026-5265",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358778,
"published_at": "2026-04-20T00:00:00+00:00"
}